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i sample collected from MW-2 Benzene, xylene, MTBE, tertiary butanol, and TAME were detected in the groundwater sample collected from MW-2 (0 4, 1 5, 550, 72 and 3 6 4g11, respectively) BTEX and TPH-G were not detected at or above the laboratory reported detection limit to the groundwater sample collected from MW-3 ' MTBE was detected to the groundwater sample collected from MW3 (7 9 µg11) BTEX, MTBE and TPH-G were detected in the groundwater sample collected from MW-4 (1 6 µg/l, 0 4 µg/l, 2 0 µg/l, 22 µg/l, 14 µg/l, and 0 8 mg/l, respectively) Laboratory analytical results for the September 18, 1997 sampling event are presented below Iin Table B 6 ITABLE B.6 Groundwater Sample Analytical Results— September 18, 1997 B T E X Gasoline TPH-G TEPH Additives I Oxygenates Kerosene Diesel Motor Oil ' Detection 0 3 0 3 0 3 0 6 10 0 05 005 0 05 0 5 Limits µg/I µg/1 µg/1 µg/1 µg/1 mg/1 mg/i mg/1 mg/1 Sample f D MWl-9/18/97 ND ND NO ND ND ND ND ND NO MW2-9/18/97 0 4 ND NO 15 550(MTBE) NO ND ND NO 72(tertiary- butanol) 3 6(TAME) MW3-9/18/97 ND ND ND ND 7 9(MTBE) ND NO ND NO ' MW4-9/18/97 16 0 4 2 0 22 14(MTBE) 0 08 NO ND NO Un t Couverslons. Analytical ' p&g parts per bdl—(pph) BTEX-benzene toluene ethyl benzene,and xylene mg/kg_parts per million(ppm) TEPH total petrolc m hydrocarbons,quantified as kerosene,diesel and motor oil TPH-G total petroleum hydrocarbons,quantified as gasoline MT13E-methyl tint butyl ether TAME-tertiary amyl methyl ether ND-none detected at or above laboratory detection bmim =other gasohine addravesioxygeaatcs ND On December 31, 1997, Condor personnel were on site to conduct quarterly groundwater monitoring Laboratory ' analyses of groundwater samples indicated that BTEX, TPH-G, and the selected gasoline oxygenates/additives were not detected at or above the laboratory reported detection limits in the sample collected from MW-1 Ethanol, DIPE, and ETBE were not detected at or above the laboratory reported detection limits in any of the ' groundwater samples BTEX, TPH-G, and tertiary butanol were not detected at or above the laboratory reported detection llanits In the sample collected from MW-3 MTBE and TAME were detected to the sample collected from MW-3 Low concentrations of BTEX constituents and TPH-G were detected in the samples collected from ' MW-2 and MW-4 MTBE was detected in.MW-4 MTBE, tertiary butanol, and TAME were detected in MW-2 No floating product, sheen, or petroleum hydrocarbon odor was noted in the monitor wells Full evaluation of intrinsic bioremediation parameters was not conducted because additional monitoring was necessary to evaluate ' the potential for intrinsic bioremediation at the site Groundwater elevation measurements collected at the site monitor wells on December 31, 1997, indicated that the average depth from the ground surface to groundwater was approximately 4 feet The average depth to water at the site decreased by approximately 2 feet between September 18, 1997 and December 31, 1997 Groundwater I